<template>
  <div class="app-container">
    <h2 style="text-align: center">发布新课程</h2>

    <el-steps
      :active="2"
      process-status="wait"
      align-center
      style="margin-bottom: 40px"
    >
      <el-step title="填写课程基本信息" />
      <el-step title="创建课程大纲" />
      <el-step title="最终发布" />
    </el-steps>

    <!-- 课程章节列表 -->
    <ul class="chanpterList">
      <li v-for="chapter in chapterVideoList" :key="chapter.id">
        <p>
          {{ chapter.title }}

          <span class="acts">
            <el-button type="text" @click="openVideo(chapter.id)"
              >添加课时</el-button
            >
            <el-button style="" type="text" @click="openEditChapter(chapter.id)"
              >编辑</el-button
            >
            <el-button type="text" @click="removeChapter(chapter.id)"
              >删除</el-button
            >
          </span>
        </p>

        <!-- 小节编辑删除 -->
        <ul class="chanpterList videoList">
          <li v-for="video in chapter.children" :key="video.id">
            <p>
              {{ video.title }}
              <span class="acts">
                <el-button type="text" @click="openEditVideo(video.id)"
                  >编辑</el-button
                >
                <el-button type="text" @click="removeVideo(video.id)"
                  >删除</el-button
                >
              </span>
            </p>
          </li>
        </ul>
      </li>
    </ul>

    <!-- 添加和修改章节表单 -->
    <el-button type="text" @click="openChapterDialog">添加章节</el-button>

    <el-dialog :visible.sync="dialogChapterFormVisible" title="添加章节">
      <el-form :model="chapter" label-width="120px">
        <el-form-item label="章节标题">
          <el-input v-model="chapter.title" />
        </el-form-item>
        <el-form-item label="章节排序">
          <el-input-number
            v-model="chapter.sort"
            :min="0"
            controls-position="right"
          />
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogChapterFormVisible = false">取 消</el-button>
        <el-button type="primary" @click="saveOrUpdate">确 定</el-button>
      </div>
    </el-dialog>

    <!-- 课程小节 -->
    <el-dialog :visible.sync="dialogVideoFormVisible" title="添加课时">
      <el-form :model="video" label-width="120px">
        <el-form-item label="课时标题">
          <el-input v-model="video.title" />
        </el-form-item>
        <el-form-item label="课时排序">
          <el-input-number
            v-model="video.sort"
            :min="0"
            controls-position="right"
          />
        </el-form-item>
        <el-form-item label="是否免费">
          <el-radio-group v-model="video.isFree">
            <el-radio :label="0">免费</el-radio>
            <el-radio :label="1">默认</el-radio>
          </el-radio-group>
        </el-form-item>

        <!-- 课程视频 
            :on-success="handleVodUploadSuccess" 上传成功
            :on-remove="handleVodRemove"    删除方法
            :before-remove="beforeVodRemove"  删除之前方法,即点x调用
            :on-exceed="handleUploadExceed"  处理超出数量后的方法
            :file-list="fileList"   上传时提供的列表
        -->
        <el-form-item label="上传视频">
          <el-upload
            :on-success="handleVodUploadSuccess"
            :on-remove="handleVodRemove"
            :before-remove="beforeVodRemove"
            :on-exceed="handleUploadExceed"
            :file-list="fileList"
            :action="BASE_API + '/eduvideo/vod/uploadAliyunVideo'"
            :limit="1"
            class="upload-demo"
          >
            <el-button size="small" type="primary">上传视频</el-button>
            <el-tooltip placement="right-end">
              <div slot="content">
                最大支持1G，<br />
                支持3GP、ASF、AVI、DAT、DV、FLV、F4V、<br />
                GIF、M2T、M4V、MJ2、MJPEG、MKV、MOV、MP4、<br />
                MPE、MPG、MPEG、MTS、OGG、QT、RM、RMVB、<br />
                SWF、TS、VOB、WMV、WEBM 等视频格式上传
              </div>
              <i class="el-icon-question" />
            </el-tooltip>
          </el-upload>
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogVideoFormVisible = false">取 消</el-button>
        <el-button
          :disabled="saveVideoBtnDisabled"
          type="primary"
          @click="saveOrUpdateVideo"
          >确 定</el-button
        >
      </div>
    </el-dialog>

    <div>
      <el-button @click="previous">上一步</el-button>
      <el-button :disabled="saveBtnDisabled" type="primary" @click="next"
        >下一步</el-button
      >
    </div>
  </div>
</template>

<script>
import chapter from "@/api/chapter/chapter";
import video from "@/api/video/video";

export default {
  data() {
    return {
      BASE_API: process.env.BASE_API,
      fileList: [],
      saveBtnDisabled: false, // 保存按钮是否禁用
      chapterVideoList: [],
      courseId: "", //课程id
      dialogChapterFormVisible: false, //章节弹框
      chapter: {
        title: "",
        sort: 0,
      }, //用于封装章节对象

      video: {
        title: "",
        sort: 0,
        isFree: 0,
        videoSourceId: "",//视频id
        videoOriginalName: "", //视频名
      },
      dialogVideoFormVisible: false, //小节弹框
      saveVideoBtnDisabled: false,
    };
  },

  created() {
    if (this.$route.params && this.$route.params.id) {
      this.courseId = this.$route.params.id;
      this.getChapterVideo();
    }
  },

  methods: {
    /*********************************上传视频操作************************************/
    //成功回调
    //file参数是这个文件对象
    handleVodUploadSuccess(response, file, fileList) {
      this.video.videoSourceId = response.data.videoId;
      this.video.videoOriginalName = file.name
    },
    //视图上传多于一个视频
    handleUploadExceed(files, fileList) {
      this.$message.warning("想要重新上传视频，请先删除已上传的视频");
    },
    //点x调用
    beforeVodRemove(file,fileList){
      return this.$confirm(`确定移除【${file.name}】吗？此操作将不可恢复`)
    },
    //点确定调用
    handleVodRemove(){
      //调用接口删除视频方法
      video.delVodById(this.video.videoSourceId)
        .then(res => {
          //提示信息
          this.$message({
            type: 'success',
            message: "视频已取消上传"
          })
          //清空文件列表
          this.fileList = []
          //清空视频id和视频名，解决删除之后仍然上传进数据字段问题
          this.video.videoSourceId= null//视频id
          this.video.videoOriginalName= null//视频名
        })
    },

    /*********************************小节操作**********************************/
    //点击编辑按钮
    openEditVideo(videoId) {
      //回显数据
      video.getVideoBackInfo(videoId).then((res) => {
        //打开编辑
        this.dialogVideoFormVisible = true;
        this.video = res.data.videoInfo;
        // console.log(this.video.videoSourceId && this.video.videoSourceId != "");
        console.log(this.video.videoSourceId != "");
        if(this.video.videoSourceId != ""){
          this.fileList = [{'name': this.video.videoOriginalName}]
        }
      });
        this.fileList = []
    },
    //编辑小节
    editVideo() {
      //调用接口中编辑方法
      video.editVideo(this.video).then((res) => {
        //提示信息
        this.$message({
          type: "success",
          message: "修改小节成功",
        });
        //关闭弹框
        this.dialogVideoFormVisible = false;
        //刷新页面
        this.getChapterVideo();
      });
    },
    //删除小节
    removeVideo(videoId) {
      this.$confirm("此操作将永久删除该记录, 是否继续?", "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning",
      }).then(() => {
        video.deleteVideo(videoId).then((res) => {
          //点击确定，调用删除方法
          this.$message({
            type: "success",
            message: "删除成功!",
          });
          //回到列表
          this.getChapterVideo();
        });
      });
    },
    // 打开添加小节弹框的方法
    openVideo(chapterId) {
      this.fileList = []
      this.video = {
        sort: 0,
        title: "",
        isFree: 0,
      };
      //显示弹框
      this.dialogVideoFormVisible = true;
      //设置小节的章节id
      this.video.chapterId = chapterId;
      //设置小节的课程id
      this.video.courseId = this.courseId;
    },

    // 添加小节按钮方法
    saveVideo() {
      video.addVideo(this.video).then((res) => {
        //关闭弹窗
        this.dialogVideoFormVisible = false;
        //显示提示信息
        this.$message({
          type: "success",
          message: "小节添加成功",
        });
        //刷新页面
        this.getChapterVideo();
      });
    },

    saveOrUpdateVideo() {
      if (!this.video.id) {
        //如果小节id为空，则是添加方法
        this.saveVideo();
      } else {
        this.editVideo();
      }
    },

    /*********************************章节操作**********************************/
    //删除章节
    removeChapter(chapterId) {
      this.$confirm("此操作将永久删除该记录, 是否继续?", "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning",
      }).then(() => {
        chapter.deleteChapter(chapterId).then((res) => {
          //点击确定，调用删除方法
          this.$message({
            type: "success",
            message: "删除成功!",
          });
          //回到列表
          this.getChapterVideo();
        });
      });
    },

    //修改弹框数据回显
    openEditChapter(chapterId) {
      chapter.getChapter(chapterId).then((res) => {
        //打开弹窗
        this.dialogChapterFormVisible = true;
        //将查出的数据赋值
        this.chapter = res.data.chapter;
      });
    },

    //添加章节按钮点击事件
    openChapterDialog() {
      //弹出弹框
      this.dialogChapterFormVisible = true;
      //清空弹框内容
      this.chapter = {
        sort: 0,
      };
    },

    //修改章节
    updateChapter() {
      chapter.updateChapter(this.chapter).then((res) => {
        //关闭弹窗
        this.dialogChapterFormVisible = false;
        //成功提示
        this.$message({
          type: "success",
          message: "修改章节信息成功",
        });
        //刷新页面
        this.getChapterVideo();
      });
    },

    //添加章节
    addChapter() {
      this.chapter.courseId = this.courseId;
      chapter.addChapter(this.chapter).then((res) => {
        //关闭弹框
        this.dialogChapterFormVisible = false;

        //成功提示
        this.$message({
          type: "sucess",
          message: "添加章节成功",
        });
        //刷新页面
        this.getChapterVideo();
      });
    },

    saveOrUpdate() {
      if (!this.chapter.id) {
        //如果有没有id，说明为添加
        this.addChapter();
      } else {
        //否则为修改
        this.updateChapter();
      }
    },

    // 根据课程id查询所有章节和小节列表
    getChapterVideo() {
      chapter.getAllChapterVideo(this.courseId).then((res) => {
        this.chapterVideoList = res.data.allChapterVideo;
      });
    },

    previous() {
      this.$router.push({ path: "/course/info/" + this.courseId });
    },

    next() {
      this.$router.push({ path: "/course/publish/" + this.courseId });
    },
  },
};
</script>

<style scoped>
.chanpterList {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}
.chanpterList li {
  position: relative;
}
.chanpterList p {
  float: left;
  font-size: 20px;
  margin: 10px 0;
  padding: 10px;
  height: 70px;
  line-height: 50px;
  width: 100%;
  border: 1px solid #ddd;
}
.chanpterList .acts {
  float: right;
  font-size: 14px;
}

.videoList {
  padding-left: 50px;
}
.videoList p {
  float: left;
  font-size: 14px;
  margin: 10px 0;
  padding: 10px;
  height: 50px;
  line-height: 30px;
  width: 100%;
  border: 1px dotted #ddd;
}
</style>